code: def acknowledge(self, ack_key):
      self.logger.debug(
          "Message with key {} acknowledged".format(ack_key)
      )
      retry(
          lambda: self.subclient.acknowledge(self.sub_name, [ack_key]),
          sleep_time=10,
          logger=self.logger,
          exception_class=RetryError,
      )
  
file_path: studio/studio/pubsub_queue.py
imports: import os
  import json
  import time
  from google.api_core.exceptions import RetryError
  from studio.util.util import sixdecode, retry, parse_verbosity, check_for_kb_interrupt
  from studio.util import logs
label_desc: Use image node_id 8 for calling the PubsubQueue obj's underlying member method code with example usage: obj.acknowledge(ack_key) without return types